Bilge-barrel-forming mechanism.



V. MAUCK.

BILGE BARREL FORMING MECHANISM.

APPLICATION FILED DEC- 9. 1912.

l 176,232. Patented Mar. 21, 1916.

FIG. I- FIG. 11. FIG. m-

INVENTOR:

WITNESSES: J

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VICTOR MAUCK, OF CONSI-IOHOCKE N, PENNSYLVANIA.

BIIJGE-BARRELEORMING MECHANISM,

Specification of LettersPatent Patented Mar. 21, 1916.

Application filed December 9, 1912. Serial No. 735,675.

To cilliwlz om it'mag concern Be it known that I, VI'oTonMAUox, ofConshohocken, in the State of Pennsylvania, have invented a certain newand useful Improvement in Bilge-Barrel-Forming Mechanism, whereof thefollowing is a specification, reference being had to the accompanyingdrawings.

The invention herein claimed is disclosed Letters Patent of the UnitedStates #I,O95,014 granted to myself and Jacob E. VVentli-ng' April 28-,1914, for an improvement in processes of making metallic barrels.

As hereinafter described my improved barrel is formed of three primarilyplane sheets of metal pressed to the required shape and having theiredges welded so as to form a unitary shell; one of said sheets beingfirst bent to forma cylindrical tube, and then expanded to the desiredbilge form, constituting the barrel body, and the other two beingpressed-to form the respectively opposite: barrel heads. V

My invention includes the various novel features of construction andarrangement of mechanism hereinafter more definitely specified. I

In the drawings'z Figure I is a side view of the cylindrical tube fromwhich the barrel body is to be formed. Fig. II is a side view of saidtube showing the initial effect of the expanding operation. Fig. III isa side view of-saidi tube completely expanded to the desiredbarrelshape." Fig. IV is a plan view of said tube shown in Fig. I, in: closingan expansible die. Fig. V is a plan view similar to Fig. IV, but showingsaid die. expanded to produce the effect indicated in Fig. II- Fig. VIis a plan view' similar I to Fig. V but showing said die and tubeeoinpletely expanded to. produce the effect indicated Fig. III. Fig. VIIis a vertical sectional view taken on the line VII-VII in Fig. IV. Fig.VIII is a vertical sectional viewtaken on the line VIIL-VIII in Fig. V;Fig. IX is. a vertical sectional view taken on the line IX.IX in Fig.VI. Figs. X and XI are fragmentary horizontal sectionalviews oftheexpansible die and I barrel body, respectively before and afterexpansion as in Figs. VII and IX.

Y A rectangular sheet metal blank is bent to, form a cylindrical tube 1,and, its meetedges, being electrically welded as they opressedtcgether.slight ridge- 2 is formed upon the outer side of the tube as indicatedFig. IV. Said cylindrical tube 1 is then fitted over the expa-nsible diecomprising thecircular series of sectors 4 while the latter are arrangedin radially retracted position as shown in Figs. IV and VII. The conicalwedge 6, being then inserted as shown in Figs. V and VIII, is pressedinto the expanding die comprising said sectors l, thus expanding saidtube 1, initially as indicated in Figs. II, V and VIII, and finally asindicated in Figs. III, VI and IX. If the outer faces 'of said sectors lconformed to arcs of the circumference of the tube when completelyexpanded; said faces would be less convex than the initially cylindricaltube It shown in Figs. I, IV and VII, and when expanded as abovedescribed, would engage said tube only at the longitudinal edges of saidouter faces of the sectors, and the expansion of said tube consequentupon the insertion of the cone 6 as above clescribed, would take placeonly at the junctions of the sectors, and, exceeding the limit ofexpansion of the metal, would rupture said tube before it reached therequired bilge shape. Therefore, we make the outer faces of said sectorsconform to arcs having radii slightly less than the radii of theexpanded tube shown in Figs. III, and IX, so that said sectors initiallyengage the cylindrical tube, shown in Figs. I, IV and VII, only at themedial, longitudinal regions of their outer faces. In other words, theexpansion of the sheet metal begins at the center of the outer face ofeach sector 4, as indicated in Figs. V and VIII, and is continued withsubstantially uniform distribution of the stresses in the sheet metaluntil the final bilge form of said tube indicated in Figs. III, VI andIX is produced. I find it convenient to effect the above describedexpansion nf the die including the sectors 4, by mounting the latterupon the bed plate 8, and forcing said wedge 6 toward said bed plate ina hydraulic press 9, incooperation with the centripetally inclined-innersurfaces of all of said sectors, to separate the latter radially from acommon center. l

The opposite end heads (not shown) of the completed barrel may beconveniently formed of primarily plane circular sheetmetal blanks whichare pressed so as to be outwardly -convexed to approximate the sphericalform affording" the greatestresist ance to distortion by internalpressure, and to form outwardly turned rims. Said heads being fittedwith their rims flush with the chimes of the barrel body shown in Figs.III and IX, may be welded in unitary relationtherewith, conveniently bymeans of an oxy-hydrogen blow-pipe, thus forming a unitary shell.

I do not desire to limit myself to the precise details of constructionand arrangement herein set forth as it isobvious that variousmodifications may be made therein without departing from the essentialfeatures of my invention as defined in the appended claims.

I claim V 1. In metal bilge-barrel forming mechanism, an expansible diecomprising a plurality of separate'sectors, each having an outer facelongitudinallycurved to the bilge shape of the barrel body to be formed,and transversely curved with radii slightly less than the radii of theinternal circumference of said body; each of said sectors having aninner centripetally inclined surface; a conical wedge common tovall ofsaid sectors and cooperating with said inclined surfaces thereof toseparate said sectors radially from a common center to expand said die,means arranged to support said sectors in assembled relation, includinga base plate upon which they are fitted to radially slide; and meansarranged to shift said wedge axially with respect to said die.

. 2. In metal bilge-barrel forming mechanism, an expansible diecomprising a plurality of separate sectors, each having an outer facelongitudinally curved to the bilge shape 7 of the barrel body to beformed. and transversely curved with radii slightly less than the radiiof the internal circumference of said body; each of said sectors havingan inner inclined surface; a wedge common to all of said sectors andcooperating with said inclined surfaces thereof to separate said sectorsradially from a common center to expand said die; means arranged tosupport said sectors in assembled relation, including a base plate uponwhich they are fitted to radially slide; and means, arranged to shiftsaid wedge axially with respect'to said die. 3. In metal bilge barrelforming mechanism, an expansible die comprising a plurality of separatesectors, each having an outer face longitudinally curved to the bilgeshape ofthe barrel body to be formed. and transve'rsely curved withradii slightly less than theradii of the internal circumference of saidbody; each of said sectors having an inner inclined surface; wedge meanscooperating with said inclined surfaces to separate said sectorsradially from a common center to expand said die; and means arranged tosupport said sectors in assembled relation, includinga base plate uponwhich they are fitted to radially slide.

4. In metal bilge-barrel forming mechanism, an expansible die comprisinga plural-' ity of separate sectors, each having an outer facetransversely curved with radii slightly less than the'radii of theinternal circum- 7c ference of the barrel body to be formed; a. wedgecommon to all of said sectors and cooperating therewith to separate saidsectors radially from a common center to ex pand said die; and meansarranged to sup port said sectors in assembled relation, including abase plate upon Which'they are fitted to radially slide. 7

5. In metal bilge-barrel forming mechanism, an expansible die comprisinga plurality of separate sectors, each having an outer face transverselycurved with .radii slightly less than the radii of the internalcircumference .of the barrel body. to be formed; means'common to all :ofsaid sectors and cooperating therewithto separate said sectors radiallyfrom a commoncenter to expand said die; and means arranged to supportsaid sectors in assembled relation, including a base plate upon whichthey are fitted to radially slide. 7 1

6. In metal bilge-barrel forming mechanism, an expansible die comprisingaplurality of separate sectors, each having an outer face transverselycurved with radii slightly less than the radii of the internalcircumference of the barrel body to be' formed; and means common, to allof said sectors and cooperating therewith to s'eparatesaid sectorsradially from a common center to expand said die. H

7. In metal barrel forming mechanism,

an expansible die including a circular series of sectors, the outerfaces of which conform to arcs having radii slightly less than theradius of said die when. expanded; whereby, said sectors. initiallyengage a c lindrical tube only'at the medial longitudinal regions oftheir outer faces, and the ex-' pansion of the metal of such a tubebegins at the center of the outer face of eachsector and is continuedwith substantially uni"- form distribution ofthe stresses in the sheetmetal until the final barrel form of said tube is produced.- 1 i 8.Mechanism for expanding an annular metallic body, including anexpansible die having a circular series of elements'each having itsouter face shaped to initially engage said body only at a line extendingg face transversely curved with radii not only less than thecorresponding radii of the inner surface of the barrel body to beformed, but less than the radius of the internal circumference of saidcylindrical tube, and longitudinally curved in conformity with saidinner surface of the barrel body; and means common to all of saidsectors and co o erative therewith to separate them radially from acommon center to expand said die whereby said sectors initially engagesaid tube only at respectively single points, intermediate of the outerfaces of said sectors both transversely and longitudinally; so that theexpansion of said tube begins at said points and is continued withsubstantially uniform distribution of the stresses in said tube until itis expanded to the final barrel form.

10. Mechanism constructed and arranged to form a bilge barrel body byexpansion of a primarily cylindrical tube; including an expansible diecomprising a circular series of separate sectors, each having an outerface transversely curved with radii not only less than the correspondingradii of the inner surface of the barrel body to be formed, but lessthan the radius of the internal circumference of said cylindrical tube;and means common to all of said sectors and cooperative therewith toseparate them radially from a common center to expand said die; wherebysaid sectors initially engage said tube only at respectively singlepoints, intermediate of the outer faces of said sectors bothtransversely and longitudinally; so that the expansion of said tubebegins at said points and is continued with substantially uniformdistribution of the stresses in said tube until it is expanded to thefinal barrel form.

11. Mechanism constructed and arranged to form a hollow metal body whichis larger at its middle than at its ends, by expansion of a cylindricaltube; including an expansible die comprising an annular series ofsectors, each having an outer face of greater radius at its middle thanat its longitudinal edges, and longitudinally shaped in conformity withthe inner surface of said body; and means common to all of said sectorsand cooperative therewith to separate them radially from a common centerto expand said die; whereby said sectors initially engage said tube onlyat respectively single points, intermediate of the outer faces of saidsectors both transversely and longitudinally; so that the expansion ofsaid tube begins at said points and is continued with substantiallyuniform distribution of the stresses in said tube until it isexpanded tothe final form of said body.

In testimony whereof, I have hereunto signed my name at Conshohocken,Pennsylvania, this fourth day of December, 1912.

VICTOR MAUCK.

Witnesses:

EDITH C. FRICK, HERBERT F. LEWIS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. O.

